In Feb. （）came President Nixon’s historic visit to Chin……

单项选择题（）part is the most densely populated region in America.

A.The southern
B.The northeastern
C.The western

单项选择题The political system of the US is based on the following except （）

A.federalism
B.the constitutional monarchy
C.the separation of powers
D.respect for the constitution
E.the rule of law